| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * This file contains all the stubs needed when communicating with lockd. |
| * This level of indirection is necessary so we can run nfsd+lockd without |
| * requiring the nfs client to be compiled in/loaded, and vice versa. |
| * |
| * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de> |
| */ |
| |
| #include <linux/file.h> |
| #include <linux/lockd/bind.h> |
| #include "nfsd.h" |
| #include "vfs.h" |
| |
| #define NFSDDBG_FACILITY NFSDDBG_LOCKD |
| |
| #ifdef CONFIG_LOCKD_V4 |
| #define nlm_stale_fh nlm4_stale_fh |
| #define nlm_failed nlm4_failed |
| #else |
| #define nlm_stale_fh nlm_lck_denied_nolocks |
| #define nlm_failed nlm_lck_denied_nolocks |
| #endif |
| /* |
| * Note: we hold the dentry use count while the file is open. |
| */ |
| static __be32 |
| nlm_fopen(struct svc_rqst *rqstp, struct nfs_fh *f, struct file **filp, |
| int mode) |
| { |
| __be32 nfserr; |
| int access; |
| struct svc_fh fh; |
| |
| /* must initialize before using! but maxsize doesn't matter */ |
| fh_init(&fh,0); |
| fh.fh_handle.fh_size = f->size; |
| memcpy(&fh.fh_handle.fh_raw, f->data, f->size); |
| fh.fh_export = NULL; |
| |
| /* |
| * Allow BYPASS_GSS as some client implementations use AUTH_SYS |
| * for NLM even when GSS is used for NFS. |
| * Allow OWNER_OVERRIDE as permission might have been changed |
| * after the file was opened. |
| * Pass MAY_NLM so that authentication can be completely bypassed |
| * if NFSEXP_NOAUTHNLM is set. Some older clients use AUTH_NULL |
| * for NLM requests. |
| */ |
| access = (mode == O_WRONLY) ? NFSD_MAY_WRITE : NFSD_MAY_READ; |
| access |= NFSD_MAY_NLM | NFSD_MAY_OWNER_OVERRIDE | NFSD_MAY_BYPASS_GSS; |
| nfserr = nfsd_open(rqstp, &fh, S_IFREG, access, filp); |
| fh_put(&fh); |
| /* We return nlm error codes as nlm doesn't know |
| * about nfsd, but nfsd does know about nlm.. |
| */ |
| switch (nfserr) { |
| case nfs_ok: |
| return 0; |
| case nfserr_dropit: |
| return nlm_drop_reply; |
| case nfserr_stale: |
| return nlm_stale_fh; |
| default: |
| return nlm_failed; |
| } |
| } |
| |
| static void |
| nlm_fclose(struct file *filp) |
| { |
| fput(filp); |
| } |
| |
| static const struct nlmsvc_binding nfsd_nlm_ops = { |
| .fopen = nlm_fopen, /* open file for locking */ |
| .fclose = nlm_fclose, /* close file */ |
| }; |
| |
| void |
| nfsd_lockd_init(void) |
| { |
| dprintk("nfsd: initializing lockd\n"); |
| nlmsvc_ops = &nfsd_nlm_ops; |
| } |
| |
| void |
| nfsd_lockd_shutdown(void) |
| { |
| nlmsvc_ops = NULL; |
| } |